Hi guys,
if you want to make a great Sencha Touch mobile application, you don't have to edit Sencha Touch CSS, but use SASS and Compass to create your own theme.
Take a look at this video to learn how.

3) then you get the binary, and you replace it on the url.the code generated goes where the phrase replace here ....binary in step 1 is located
be sure to leave the leading comma and the trailing single quote in place

adding semi-colon to end is optional (if it is the last statement in the CSS set). It is still preferred to show that the style attribute:value pair is done, and it is required if you have other CSS attribute:value pairs after it.

For single quote or double quote, both will work for the 'ui' value, it doesn't matter